Method of plastering wall-surfaces.



c. WEBER. METHOD 0F PLASTERING WALL SURFACES. APPLICATION FILED 1:58.12' i914- RENEWED MAR. 29| |915.

Patented May 11, 1915.

22., NAA/ `finely separated condition, land that supply- UMTED STTSPTENT oFFIcEz' CARL warnte-or cliracip, ILLINoIs'.

METHOD or PLASTERING'HWLL-sUnrAcEs;

To all whaha it may concern Be it known that I, CARL WEBER, afcitizeny of the United States, residing at Chicago,

inthe county of Cookandi State of Illinois, f,

Each employs a machine for impelling the mixture of materials (as cement and sand) by air-pressure through anozzle-tipped fiexible hose, one for operating by what' is known as the wet process andthe other by what is known as the dry process. By

the wet process all the water used for hy'-v drating the cementitious material` is supplied thereto in a hopper or closed tank, andV the material is thereby reduced to aconsistencyto adapt it to llow readily throughV pipes; but the large quantity of water thusadded renders the plaster porous and thus impairs it for its purpose. 0n the other hand, if the .quantity of addedwater berela 'tively7 small, the material tends to clog the pipes "and produce costly dela-ys:- By the dry process,'the materialfvformed of tllemixture is blown in the condition of a drypowder through ,the hose and all the water is added to it within the nozzle;y The practice of the method in'this way is attended' with various troubles, asthe more serious among which may be mentioned that the cementitious portion ofthe material fails t'o adhere to the'rema'inder or aggregate thereof while under propulsion and leaves the nozzle 4in a ing the vwater only in vthe nozzle fails to thoroughly meisten all particles of the material, because the distance between the nozzle and point of application of the plaster is too short for thorough action of the water to take place therein, and, moreover, a great loss ensues from dusting The, object of my invention is to avoid the objections in both systems referred to.

For the practice `of my improved method, a suitable machine is shown in the accompanying drawing by a broken view in sectional side elevation. l

A hopper 1 Surmounts and opens into a Specification af Letters Patent'.

Twof systems of thus applying plaster are lmownl tome as being in more or less extensive use.-

neck 2 terminating'at itslower end in a hor- 1zontal'lyextending nipple 3 to which@ is ,coupled a flexible hose 4f carryingonitsfdistal-enda nozzle 5-provided about its' eXtrem- 2l is a oylindrieall chamber 2'l containing a rotary valve 8 centrally journaled` in the chamber andwhich may be rotatedl` by hand or otherpower. The valve isV formedi ot a central diaphragnr extendingdiametrically* across the chamber and' having arcshaped walls extending.- im opposite directionsV from its endsto forml chambers 8*' and" 8*? provided, respectively, with, openings 8- and- 8d' to-eommunicate alternately withthe hopper and! the neck` below thechamberf- A nozzle 9 connectedy with a,E source..(not shown) of `air under pressure,leads throughthe back of the neck in line with. the inlet-endV of the- PatentedfMay 11, 1915. Y

221157712,I 1914, Serial No: 812,380. Renewedflrch: 291.1916;- Serial No. 17,887:

so f

coupling of thehose 4. Immediately'below thel chamber 2* a spraying ring 10 ispr-ovided in the neck, being let into the' wall thereof, and has a` pipe-connection 11v with a Source (not show-n) et water or other liquid or wet-steamy supply.

To operate'- the machine. thus described, the material (such as. a. mixtureoi cement and'sand) is lled into the hoppenthereby filling the valve-chamber 8 or 8, whichever- 1s open tothe-hopper` Upon-then. turningthe valve half-way about the other chamber will be filled from the hopper1 and the rst-named chamber will empty its contents into the lower part of the neck. While the machine is being operated, air or'other fluid under pressure is constantly admitted into the neck through the nozzle 9, and water is forced throu h the pipe 7 into the annular chamber 6. nly sulicient water is added to the material, either in or before it enters the hopper, or from the spray-ring 10 in therdischarge of the material `from a valve-chamber, tol thoroughly envelop the solid particles of ythe material with a filml of water, so that the cement and-sand willA better cohere while undergoing propulsion, 3

and start hydration of the cement. iT

the path of pressure from the nozzle 9;,and is blown through the hose 4 and nozzle 5.

he material in dropping from the valve enters` The small quantity of water used for startg ing hydration, as stated, facilitates the movement of the plaster-mixture under the impelling pressure, and requires consumption of a minimum quantity thereof, since it reduces the skin-friction in the' hose. When the material thus blown reaches the discharge-end of the nozzle 5, 'additional Water from the openings 6*- mixes with it and readily unites therewith because of its preparatorily moistened condition, and forms the plaster in a proper state for application to a Wall-surface.

The spray-ring may be used either for the Water-adding purpose stated, or for mixing oil or coloring matter to the material; and it may be used to supply steam in cold Weather -to prevent freezing in the practice of the process.

As will be observed, the valve 8 in any position affords an air-lock against the escape of Huid-pressure past it from the.

nozzle 9; and the valve-chambers receive and discharge the material in measured quantity, thereby conducing to uniformity in the plaster-product.

From the foregoing description of my improved method, it will be apparent that it prevents all loss bydusting; that the preparatorily moistened cement and sand will cohere in motion with sulicient` tenacity to l resist separation under the force of the airpressure, and will, by reason of the moistened condition, take the added Water readily and thus result in a uniform quality of plaster; that it eliminates all dangervof the material clogging the passages, and avoidsv the need of,v using for that purpose an excessive quantity of water inthe material, which would tend to impair the proper density and impermeability of the plaster;A

and that it effects economy in the use of lmpelling air-pressure.

What I claim as new and desire to secure by Letters Patent is 1. The method of applying plaster to wall-surfaces, which consists in passing the cement and sand ingredients, in a condition of being only suliciently moistened to cohere and start hydration of the cement, into the path of fluid-pressure currents, im` pelling the mixture by said pressure to the point of delivery to a wall-surface, and introducing the remaining water necessary to produce complete hydration into the previously moistened mixture near said point.

2. The method of applying plaster to wall-surfaces, which consists in passing the cement and sand ingredients, in measured quantity and in a condition of being only suliiciently moistened to cohere and start hydration of the cement, into the path` of the fluid-pressure currents, impelling the measured and moistened mixture by said pressure to the point of delivery to a Wallsurface, and introducing the remaining Water necessary to produce complete hydra.

tioninto said mixture near said point.

3. The method of applying plaster to wall-surfaces` which consists in passing the cement and sand ingredients intoft'he path of lfluid-pressure currents, introduclng into the mixture on its approach to said path only sufficient Water to produce cohesion of the `particles of the ingredients and start hyv dration of the cement, impelling the moistened mixture by said pressure to the point of delivery to a wall-surface, and lntroducing theremaining Water necessary to lproduce complete hydration into said mixture near said point. V s CARL WEBER. f In presence of A. C. Fiscrmr F. A. FriolznraA 

